I’ve never had a Cyberpower that hasn’t worked just find with but. Nuts a PITA to configure, but other than that it likes Cyberpower. I have that model - without the 3-R - and it’s great.

I would be extremely surprised if the 3-R version didn’t work. With Cyberpower, I don’t even bother to look up compatability. I bought 3 EC850LCDs blind, for the router and a couple other servers around the house. They all came up just fine.